Incandescent electric lamp



May 3, 1932. o. s. GUSTIN INCANDESCENT ELECTRIC LAMP Filed June 23, 1928 INVENTOR D.S.Gusrm ATTORNEY Patented May 3, 1932 UNITED STATES PATENT OFFICE.

DANIEL SNYDER GUSTIN, OI BLOOMFIELD, N EW JERSEY, .ASS'IONOR TO WESTINGHOUSE LAMP COMPANY, A CORPORATION OF PENNSYLVANIA.

INCANDESCENT ELECTRIC LAMP Application filed June 23, 1928.

This invention relates to incandescent electric lamps and relates more particularly to lamps of the concentrated light source type.

Incandescent electric lamps of the type t which embody a concentrated light source are usually constructed with a coiled filament mounted on support wires which extend from a non-conductive support called an arbor. The arbor is consolidated with a flare tube and exhaust tube constituting a stem, which stem is sealed to the neck of a bulb. In completing the operation the bulb is evacuated through the exhaust tube, the exhaust tube tipped off to seal the bulb from the atmosphere and a base supplied to the bulb neck.

The above briefly outlined construction for a concentrated filament lamp has proved sufficiently rugged for ordinary lighting purposes. The present invention, however, relates to a special form of lamp, such as is used "for locomotive headlights. Lamps of this character are operated while positioned with the longitudinal axis of the bulb disposed at an angle to the vertical. Inasmuch as such lamps are subjected to considerable vibration, jars and impacts, it is important that the filament or light source be so supported that the detrimental forces attending the vibrations be dissipated. Furthermore, in a lamp of the present character, which is used with a spherical or other form of reflector, it is desirable to so arrange the filament as to direct a concentrated beam of light directly forward and downwardly to the track in advance of the locomotive and to provide less concentrated lateral beams of light to illuminate areas at opposite sides of the track.

It is an object of the present invention, therefore, to provide a lamp of the above mentioned character in which the light source is so supported as to avoid detrimental effects through vibration or jars.

Another object of the invention is to provide av light source of such formation that the reflected imagethereof will provide a concentrated beam of light in one direction and diverging less concentrated beams in other directions.

Other objects and advantages of the invention will be apparent from the following de- Serial No. 287,726.

scription and accompanying drawings, in which Figure 1 is a perspective view ofa lamp mount constructed in accordance with the present invention;

Figure 2 is a side elevational View of the Lnofgnt shown in Figure 1 embodied in a Figure 3 is a plan View of the filament or light source of substantially a double spiral form in accordance with the present invention; and

Figure 4 is a diagramatic view of a reflecied image of the filament indicating the relative concentration of the beams of light.

A practical embodiment of the invention may, as shown in Figure 2, comprise a bulb 10 having a stem 11 sealed thereto in the usual manner, a base 12 being secured to the neck of the bulb. The stem 11 is provided with the usual press 13 and extending therefrom areprovided resilient support members 14 and 15 (see Figure 1) which are connected with conductors 16 and 17, respectively. Each of the support members 14 and 15 is provided with a flattened portion 18 which is bent at 19 to provide lateral spring members 20 and 21. I

The ends of the members 20 are secured by welding or clamping to support members 22 and 23 which extend through a non-conductive cross piece 24, which latter may be of any suitable material, such as glass, lavite, or the like. The upper ends of the'supports 22 and 23 are of such diameter as to receive and firmly fit within ends 25 and 26 of a filament 27. The said filament is shaped in the form of a double spiral, as shown in Figure 8, having loop portions 28 and 29 in close relation to provide a concentrated spot of light. The loop portions 28 and 29 terminate in bent portions 31 and 30, respectively, which diverge from the loop portions so as to provide a gradual decrease in concentration of light. For the purpose of supporting the filament with the loop portions 28 and 29 in proper spiral relation, a pair of support members 32 and 33 are provided, the ends of these members being embedded in the cross piece 24. The bent ends or terminals whereas 30 and 31 of the filament are held in position by support members 3 1 and 35, the ends of thesesupport members being embedded in the cross piece 24a A lamp constructed as above described may be employed in connection with a reflector 36, as shown diagrammatically in 34. The lamp is operated with its longitudinal axis, indicated by dotted line 37, at an angle to the vertical indicated by dotted line 38. When rendered incandescent the enlarged image of the filament is projected and, by reason of the arrangement of the loops 28 and 29, a concentrated beam of light results, indicated by closely spaced lines 39, while the bent portions 30 and 31 throw less concentrated beams of light 40 and 41, which are indicated by lines of wider spacing.

It will be understood that the projected filament as shown is for the purpose of illustration shown in a plane facing the observer,

in fact, the filament when in a locomotive headlight lamp is'in such position that the concentrated beam of light 39 is directed at an angle outwardly to the track ahead of the locomotive while the less concentrated beams of light 40 and 41 are directed laterally to illuminate the opposite sides of the track.

The present construction includes a filament supporting unit comprised of a cross member 24; and supports which hold the filament in proper relation. Thus the supporting structure of the filament is self contained and independent of other parts of the device, so that it may move as a unit without relative movement between the filament and the adjacent parts of the unit during vibration. This is possible by reason of the spring members or resilient supports 14 and 15 which serve as an elastic or cushion connection between the press or rigid portion of the lamp and the unitary supporting structure for the filament. I

By reason of the present invention, there fore, a light source having the desired arrangement of filament for the projection of beamsof light is provided and such light source is maintained free from detrimental efiects due to vibration or sudden impact, making the entire structure especially useful as a locomotive headlight or in other field's, as factories or general car lighting, where the lamp is subject to unusual vibration.

Although a preferred embodiment of the invention is shown and described herein, it is to be understood that modifications may be made therein without departing from the spirit and scope of the invention as set forth inthe appended claims.

What is claimed is:

1. An electrical device comprising a press, a bulb, a filament supporting structure including a non-conductive cross-bar, a plurality of support members having ends embedded in said cross-bar and with hooked portions on their free ends, said free ends eing disposed in adjacent relation, a hooked filament disposed in said hooked portions, additional support members extending through said cross-bar, and having their upper ends connected with the terminal of saidfilament, and resilient means connecting the lower end of said last mentioned support members with said press. I

- 2. An incandescent electric lamp comprising a bulb, a supporting structure including a non-conductive cross bar, support membeis extending from said cross bar and terminating in hook portions disposed in close space relation, a coiled filament formed to provide a double loop, portions of each loop partially surrounding portions of the opposite 100 and having their terminal portions exten ing in a direction substantially transverse to the plane in which the loops are disposed, said loops being disposed in said hook portions and conductors connected with said terminal portions.

3. An incandescent electric head light lamp comprising a bulb, a supporting structure including a non-conductive cross bar, support members extending from said cross bar, a filament formed to provide a plurality of loops disposed substantially in a common plane, portions of each loop partially surrounding portions of an opposite loop and having the terminal portions of the filament extending in a direction substantially transverse to the plane in, which the loops are disposed, said loops being attached to the ends of said support members.

4. An incandescent electric lamp comprising a bulb, a supporting structure including a non-conductive cross bar, support members extending from said cross bar and terminating in hook portions, a filament consisting of a length of wire arranged with the major portion of its length in close proximity and supported by said hook portions to direct a concentrated beam of light, the terminals of said filament being disposed in space relation to direct a lateral less concentrated beam and conductive members connected with said terminals.

5. An incandescent electric head light lamp comprising a helically coiled filament consisting of alength of wire arranged with the major portion of its length in close proximity to direct a concentrated beam of light, a non-conductive cross bar having support members terminating in hook portions to re- 'ceive and support the said major portion of the filament, the terminals of said filament being disposed in space relation to direct a less concentrated light beam, and conductive members extending into the terminal portions of said filament.

6. An incandescent electric lamp comprising a bulb a supporting structure including a non-conductive cross bar, support members extending from said cross bar and terminating in hook portions, a double loop helically coiled filament havin its loops disposed in said hook portions 0? the support members and conductor members extending into the terminals of said filament.

7. An incandescent electric lamp comprising a bulb, a supporting structure including a non-conductive crossbar, support members extending from said cross bar and terminating in hook portions disposed in close space relation, a double loop filament having its loops disposed in said hook portions of the support members, conductor members extending from said cross bar and connected with the terminals of said filament.

In testimony whereof, I have hereunto subscribed my name this 22nd day of June DANIEL SNYDER GUSTIN. 

